شماره ركورد :
421023
عنوان مقاله :
تعيين تركيب مناسبي از عناصر ژيوشيميايي براي جداسازي واحدهاي سنگ شناسي حوضه پخش سيلاب پلدشت
عنوان به زبان ديگر :
Determinining a suitable subset of geochemical elements for Separation of lithological types of Poldasht waterspreading station basin
پديد آورندگان :
حكيم خاني، شاهرخ نويسنده دانشكده منابع طبيعي- دانشگاه اروميه Hakimkhani, SH , احمدي، حسن نويسنده دانشكده منابع طبيعي- دانشگاه تهران Ahmadi, H , غيوميان، جعفر نويسنده پژوهشكده حفاظت خاك و آبخيزداري Ghayoumian, J , فيض نيا، سادات نويسنده دانشگاه تهران- دانشكده منابع طبيعي Feiznia, S , بي همتا، محمدرضا نويسنده پرديس كشاورزي و منابع طبيعي-دانشكده كشاورزي- دانشگاه تهران-كرج Bihamta, M.R.
اطلاعات موجودي :
فصلنامه سال 1386
رتبه نشريه :
فاقد درجه علمي
تعداد صفحه :
19
از صفحه :
693
تا صفحه :
711
كليدواژه :
عناصر ژيوشيميايي , منابع رسوب , واحدهاي سنگ شناسي , پلدشت , منشايابي
چكيده لاتين :
Because of many problems associated with traditional procedures for identifying sediment sources, fingerprinting techniques, based on physical, chemical and organic properties of sediment and source materials, are increasingly being used as a valuable and effective alternative approach to assemble such information. The first step involved in the application of this approach is the selection of a composite of diagnostic properties which clearly discriminate sediment sources. In this study, it is tried to choose a suitable composite of geochemical elements with the ability to discriminate lithological types in subareas of main subbasin of Pouldasht water spreading station basin, located in Makoo County, West Azarbaijan Province. The lithological maps were prepared, and lithological types as sediment sources were classified in five groups. Totally, 106 samples representing lithological characteristics, including uses, slope steepness and surface and subsurface erosions, were selected. Samples below 63 jim were separated and concentration of 18 geochemical elements was measured. Then, after being assured of the absence of outliers and insubstantial contribution of non-normality and inequality of covariance matrices to the results, the discriminant analysis was used to select the suitable subset of elements from the 18 geochemical elements. In order to eliminate the effects of multicollinearity on the discriminant analysis results, a subset (composite fingerprint) of elements, which enjoys both characteristics of least multicollinearity and highest discriminating power, was selected. The identified subset included 12 elements (Al, Co, Cr, Cu, Na, Zn, Mn, Ni, Pb, Mg, Sb and K) and was able to discriminate and classify over 87.7 percent of soil samples correctly. Meanwhile, all the 18 elements were ranked based on their relative ability to distinguish lithological groups, among which Ni was the most important and As and Sr played the least important role.
سال انتشار :
1386
عنوان نشريه :
منابع طبيعي ايران - دانشكده منابع طبيعي كرج
عنوان نشريه :
منابع طبيعي ايران - دانشكده منابع طبيعي كرج
اطلاعات موجودي :
فصلنامه با شماره پیاپی سال 1386
كلمات كليدي :
#تست#آزمون###امتحان
لينک به اين مدرک :
بازگشت